Survival of V2D1 cells depends on the IKK-mediated IL-3 production (A) V2D1 cells were cultured in IL-3-free medium for different time periods. Lysates were analyzed by westernblotting. (B–D) V2D1 cells were treated with the IKK-inhibitor VII. Lysates were analyzed by westernblotting (B) or cells were probed with [H 3 ]thymidine (C) or PI (D) . Cells were analyzed by β -counting (C) or by flow cytometry (D) ( C ; p